After collecting 85% of the char dossiers I'm advancing very slowly. You cannot obtain them killing the same mimic with the same hero, you need to kill them all with all heroes, both mimic and the real ones that come to challenge you. I had to make a sheet to keep track with who i killed and with what hero, and since I've ignored the fact that the real ones counted on the first time i checked the entire sheet, now I'm doing it all over again just for the ones missing.

I can't say that I'm a 100% sure but at least it worked a lot better for me. Playing only with my 3 better chars i had also finished some of the chars with smaller dossiers numbers, but for the ones with more then 5 they simply stopped to drop, I kept playing with them for like 3 days and got nothing, as soon as I started to mix party members the numbers of CHAR dossiers drops increased greatly.

You can, you need 5 transmitters to attack the hatchery and get the wyvern x to give to the commander to get the codes and get the transmitters again but instead of putting the codes in you get the wyvern x again. At this point you go and get a transmitter againto have all three items. All of this will take multiple play through and time.

I'll gladly do that. I wonder if these means we may see some intresting stuff about this in the future.